chore: Drop Node 12 support.

[avocadowastaken]

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[codecov]

Codecov Report

Merging #78 (60efcde) into main (9728165) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #78   +/-   ##
=======================================
  Coverage   97.12%   97.12%           
=======================================
  Files          11       11           
  Lines         904      904           
=======================================
  Hits          878      878           
  Misses         26       26           

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